7.8

CVE-2025-40167: linux

CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2025-40167DEBIAN-CVE-2025-40167
Published 12-11-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-40167 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.4% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 45 · Related 43
DLA-4379-1DLA-4404-1OPENSUSE-SU-2026:20145-1SUSE-SU-2026:0278-1SUSE-SU-2026:0281-1SUSE-SU-2026:0293-1

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: detect invalid INLINE_DATA + EXTENTS flag combination syzbot reported a BUG_ON in ext4_es_cache_extent() when opening a verity file on a corrupted ext4 filesystem mounted without a journal. The issue is that the filesystem has an inode with both the INLINE_DATA and EXTENTS flags set: EXT4-fs error (device loop0): ext4_cache_extents:545: inode #15: comm syz.0.17: corrupted extent tree: lblk 0 < prev 66 Investigation revealed that the inode has both flags set: DEBUG: inode 15 - flag=1, i_inline_off=164, has_inline=1, extents_flag=1 This is an invalid combination since an inode should have either: - INLINE_DATA: data stored directly in the inode - EXTENTS: data stored in extent-mapped blocks Having both flags causes ext4_has_inline_data() to return true, skipping extent tree validation in __ext4_iget(). The unvalidated out-of-order extents then trigger a BUG_ON in ext4_es_cache_extent() due to integer underflow when calculating hole sizes. Fix this by detecting this invalid flag combination early in ext4_iget() and rejecting the corrupted inode.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.01 pp

From 0.15% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu153 products
  • linuxAll versions (No fix recorded) | < 5.15.0-170.180 | < 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1100.107 | < 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < 4954d297c91d292630ab43ba4d195dc371ce65d3 | ≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < f061f7c331fc16250fc82aa68964f35821687217 | ≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < 2e9e10657b04152ed0d6ecae8d0c02a3405e28f5 | ≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < 1437c95ab2a28b138d4521653583729f61ccb48b | ≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < cb6039b68efa547b676a8a10fc4618d9d1865c23 | ≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < de985264eef64be8a90595908f2e6a87946dad34 | ≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < 1f5ccd22ff482639133f2a0fe08f6d19d0e68717 | ≥ f19d5870cbf72d4cb2a8e1f749dff97af99b071e, < 1d3ad183943b38eec2acf72a0ae98e635dc8456b | 3.8

3 vendors · 155 products

References

41 links
Show all 41 references